netns: Replace zero-length array with DECLARE_FLEX_ARRAY() helper

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/225
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/YzIvfGXxfjdXmIS3@work
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
index 7ce68183f6e180cdf1032e6edc60da00b9aed25a..00c399edeed11c79e9640e1c2932bd39f155c10c 100644 (file)
--- a/include/net/netns/generic.h
+++ b/include/net/netns/generic.h
@@ -33,7 +33,7 @@ struct net_generic {
                        struct rcu_head rcu;
                } s;
 
-               void *ptr[0];
+               DECLARE_FLEX_ARRAY(void *, ptr);
        };
 };